Insulator and wire-clamp.



J. BLACKBURN.

' AR. 2, 1908. I 915,330, Patented Mar.16,1909.

unrrnn sTA'rEs PATENT OFFICE. JASPER BL cKB mi, Op 1335 MISSOURI. Y i Q Specification or Letter! Patent. Bantam 10, 19cc. 2

' Application mm larch 2, 190a. s rm murals.

Toallwhom'itmay Be it known that I, JASPER BLAcnUnN, a

citizen of the United States, and resident of St. Louis, Missouri, have invented certain new and useful Improvements in Insulators and Wire-Clamps, of which the following is a specification containing a full, clear, and exact description, reference bein had to the accompanying drawings, forming 'a part hereof.

' My invention relates to an insulator for electric wires, which insulator is particularly intended for useon cross arms of wire and cable supporting poles, and said insulator being so constructed as to clamp and hold a wire without the use of tie wires, and being adapted to be partially rotated so as to tighten or take up the slack in the wire between a pair of the insulators.

To the above pu oses, my invention consists in certain nove features of construction and arrangement of parts, which will be hereinafter more fully set forth, pointed out in the claims, and illustrated 1D. the accompanying drawings, in which:

Figure 1 is an elevation'of an insulator of my improved construction in position on a cross arm; Fig. 2 is a plan view of the insulator seen in Fi 1; Fig. 3 is a vertical section taken on the line 33 of Fig. 1; Fig. 4 is a horizontal section taken on the line 44 of Fig. 3; Fig. 5 is a vertical section of a modified form of the in cross arm, and which carries the insulator; Fig. 6 is a horizontal section taken on the line 6-6 of Fig. 5.

Referring by characters of reference to the accompanying drawings :1 designates the cross arm, or other support for the insulators, 1 and passing vertically therethrough is a pin 2, 1 provided on its up er end with a head 3, the,

upper portion of w ich is screw threaded, as designated by 4.

The insulator pro er comprises an aproximate cylindrical ody 5, of glass, porceain, or analogous material, and the lower portion of sai body flares outward so as to readily shed water; and formed in the under side of thisbody is a screw threaded recess 6,

in which the screw threaded upper end 4 of the head 3 engages. p I

Formed in the upper' portion ofgthe insulator body is a notchjjor recess 7,which is I in'j icross section,

approximatel VV-shap and which fol ows acorn which is seated in the --in g across the body of the insulator; and the ends of the bottom of this notch or recess are rounded, as designated by 8, and undercut, asdesignatedbyQ. m 1

A horizontally disposed roove A is formed in the surface of the ins ator body, atthe approximate center thereof, which groove is for the purpose of receiving atie wire, should the same be found necessary in clamping a wire to the insulator. Leading -;from the center of this groove, diagonally downward through the body of the insulator, is a passageway 10, which is for the urpose of carrying off any water which mig t accumu: late in the notch or recess; 01', in some instances, this passageway may be dis ensed with and the central portion of the ii of the notch or recess may be made slightly higher than the ends thereof, thus accomplishing thesame result.

In Figs. 5 and 6 I have shown a metal pin 11, which takes the place of the wooden pin 2, and on said metal pin is formed a flange or collar 12, provided on the under side with.

tioned therein, and thus prevents the rotation of the sleeve in the cross arm. Formed integral with the disk 15 is a collar 17, provided on its upperedge with ratchet teeth 18, which oppose the ratchet teeth 13.

The lower end of the pinl 1 is threaded and adapted to receive a nut 19.

Instringing electric wires and cables, the same are generally laid upon the cross arms of .adjacentioles, and, after being stretched,

are attache to the insulators, and this promy im roved construction are used. The wire is ropped into the notch or recess 7 and fitted into the lower end thereof, and the in-v sulator body and pin 2 are now partially rotated in such a manner as to draw the wire from both directions toward the insulator;

and, in so doing, the wire. on both sides of the ottonf cedure is usually followed when insulators of insulator is drawn into the rounded under cut ends'of the notchor recess; and, this arrangement, together 'with the compound" curved shape of the notch, very firmly \110. Q

clam s the wire in the insulator, without the use tie wires or auxiliary clampin means.

-When the insulator has been rotated to such slight vertical movement of the pin 11, and

after the wire has been engaged 1n the notch I in the upper portion of the insulator, said inrial, in the upper sulator and pin arerotated until the wire is tightened and clamped, and during this rota- .tion the teeth 13 travel past the teeth 18. 'When the parts have been properly set, the nut 19 is tightened on the ower end of the pin ,11, thus preventing any vertical movement of the pin and consequent rotation.

An insulator of my improved construction is sim is, inexpensive, is adapted for holding and c amping all kinds of wlres and cables, and said wires and cables are very rigidly held in the insulator without the use of clam s or tie wires.

I c aim:- 1. A device of the class described, comprising a body constructed of insulating quateorti on of which is formed a notch V- haped in cross section and which follows a compound curve across the insulator, and the ends of the bottom of said notch being under cut, and there being a body, havingl at there being a passage-we.

horizontally disposed groove formed in the surface of the body of the insulator.

2. The combination with an insulator com ound curved wire receiving notc orme in its upper portion which notch is V-shaped in cross section and leading downward through the body of t e insulator from said notch, of a pin detachably fixed to the insulator body, and which pin is rotatably arran ed in a suitable support.

3. he combination with a support, of a in arranged for rotation therein, an insuator body carried by the upper end of the pm, in the upper portion of which insulator od is formed a compound curved notch, V-s aped in cross section and there being a horizontally disposed roove formed in the surface of t e bod of the insulator below the notch therein, an the ends of the bottom of said notch being under cut. 4. An insulator and wire clamp, comprismg a cylindrical body, in the upper portion of which is formeda compound curved wire receiving notch, which notch is V-shaped in cross section, and there bein a passageway leading downward through t e body of the insulator from the center'of the notch.

In testimony whereof, I have signed my name to this specification, in presence of two subscribing witnesses.

JASPER BLACKBURN. Witnesses:

M. P. SMITH, I E. L. WALLACE. 

